OK my son arrive home with some creatures living in a small water container.. I can only describe them as being under a cm in length, having a long thin black body (like thick black cotton) with transparent fins (maybe ten each side) and two small googly eyes... please can anyone tell me what they are?

Kelly, I moved your thread to ecology seeing as your questions really has nothing to do with pets.

Hopefully someone can better help you in this forum.

Thanks sorry never seen the other category... only new to this sitw!